... 4. Frequency response: (3dB )60Hz~400Hz Q-25B High power dual 15 inch subwoofer 1.Q-25B is a kind of ... and DISCO, outdoor performance, stadium, club and other public places.dual 15-inch subwoofer 15 inch subwoofers with box pro audio ... (mm)WeightNet:52Kg Q-25B Structure Q-25B High power dual 15 inch subwoofer